Simulink trying to map struct to run-time parameter

Question

Marshall Trout 2019-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/477099-simulink-trying-to-map-struct-to-run-time-parameter

回答： Noah Tang 2021-9-28

When attempting to run a function inside a Simulink model the simulation always fails due to the following error:

Unable to map parameter 'VarName' in 'FunctionName' to a run-time parameter. This parameter is an unsupported variable class such as a string, structure, cell, or an unsupported data type.

VarName is indeed a struct, but I do not understand why Simulink is attempting to make it a run-time parameter. VarName contains the initial conditions and online parameters used throughout the simulation. The Simulink model was built in 2013a and I am attempting to update it to run in 2017b. How can I prevent this error from occuring?

Thanks in advance.

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Answer 1

Marshall Trout 2019-8-26

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https://ww2.mathworks.cn/matlabcentral/answers/477099-simulink-trying-to-map-struct-to-run-time-parameter#answer_389131

Unsure what the actual cause was, but a windows update seems to have cleared up the error.

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Toheed Ghandriz 2019-9-26

I got the same error but it was solved after removing the check mark in front of 'Tunable' in Edit data dialog box for 'VarName'. My VarName was structure too.

Hong Yang 2021-1-20

Thank you, Toheed Ghandriz !

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Answer 2

Noah Tang 2021-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/477099-simulink-trying-to-map-struct-to-run-time-parameter#answer_796854

I was able to reproduce the same error message, and the comparison shows that the error happens when one field of my struct variable has an empty array as its value. Otherwise, the parameter passing process works just fine.